import { config as loadDotenv } from "dotenv";
import { z } from "zod";

loadDotenv();

const emptyToUndefined = z.preprocess((value) => {
  if (typeof value !== "string") {
    return value;
  }
  const trimmed = value.trim();
  return trimmed.length === 0 ? undefined : trimmed;
}, z.string().min(1).optional());

const envSchema = z.object({
  LOCAL_AI_VENV_PATH: z.string().min(1).default(".local-ai/.venv"),
  LOCAL_AI_PYTHON: emptyToUndefined,
  AUDIO_SOURCE: emptyToUndefined,
  WHISPER_MODEL: z.string().min(1).default("large-v3-turbo"),
  WHISPER_LANGUAGE: z.string().min(1).default("ko"),
  WHISPER_DEVICE: z.enum(["auto", "cuda", "cpu"]).default("auto"),
  WHISPER_COMPUTE_TYPE: z.string().min(1).default("auto"),
  WHISPER_BEAM_SIZE: z.coerce.number().int().min(1).max(8).default(1),
  DEBUG_TRANSCRIPTS: z
    .string()
    .optional()
    .transform((value) => value === "true"),
  LOG_LEVEL: z.enum(["debug", "info", "warn", "error"]).default("info"),
});

export type AppConfig = z.infer<typeof envSchema>;

export function loadConfig(): AppConfig {
  return envSchema.parse(process.env);
}